Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d075948a9e5eaa6…

MALICIOUS

PDF

66.0 KB Created: 2021-06-10 23:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27935927374bf9a53790244063f4d8f4 SHA-1: 97565afe9e2026366820961c545ae68316ee7110 SHA-256: 3d075948a9e5eaa692a00f4a9b6f75214e70692886e47032297cf3de9c25be37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external websites. Several of these URLs point to compromised WordPress upload directories, suggesting an attempt to lure users to potentially malicious content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8125

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=polynomials+class+10+questions+with+answers
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbf6d8366---92720641922.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcd8154f2a---mejibumodalifovuna.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fvk923epdb2sv6429o815ek0t7/4502982495.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/tofumonejigusanosu.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31fd63863f---zejisumumobad.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d7c65d137aca120c2f6b7845bdf3158f/tovulakizajuluna.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a710d1bb06a---44406819536.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d585a852c4---46011724431.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/43679c8733f79291a38b8b97d09e4c04/safifuragijivorinuwudopi.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7eebffb3---90741719002.pdf
    • http://www.abcklima.hu//data/editorfile/lamenokuxomoxenukizilir.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hd050aa566a6lhrfj14o4amspu/47546753460.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c090d0d3e04---weketekoruxewiletew.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/de0b772237ac81f0ad154ac3e4e7cad1/zapobavejaminadofumizi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb40.bin
f47f800648a4c08cfbedc7a951147d4f7eb7bc8240db222803fc32c8d06a541d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 5556 bytes

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